/* =========================================
   1. CSS Variables & Reset
   ========================================= */
:root {
  /* Colors - Slate & Indigo Theme */
  --bg-primary: #0f172a; /* Slate 900 */
  --bg-secondary: #1e293b; /* Slate 800 */
  --text-primary: #f8fafc; /* Slate 50 */
  --text-secondary: #94a3b8; /* Slate 400 */
  --accent-primary: #6366f1; /* Indigo 500 */
  --accent-hover: #4f46e5; /* Indigo 600 */
  --border-color: #334155; /* Slate 700 */

  /* Spacing & Sizing */
  --container-width: 1200px;
  --header-height: 80px;
  --radius-sm: 6px;
  --radius-md: 12px;

  /* Typography */
  --font-main: "Inter", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

ul {
  list-style: none;
}

img,
svg {
  display: block;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =========================================
   2. Typography & Utility Classes
   ========================================= */
h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.05em;
}

h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
}

.text-gradient {
  background: linear-gradient(
    to right,
    var(--accent-primary),
    #a855f7
  ); /* Indigo to Purple */
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section {
  padding: 5rem 0;
}

.bg-alt {
  background-color: var(--bg-secondary);
}

.section-title {
  margin-bottom: 3rem;
  text-align: center;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--accent-primary);
  margin: 0.5rem auto 0;
  border-radius: 2px;
}

/* Icons */
.icon-sm {
  width: 1.25rem;
  height: 1.25rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white;
  border: 1px solid var(--accent-primary);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-outline {
  border: 1px solid var(--border-color);
  background-color: transparent;
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--text-primary);
}

/* =========================================
   3. Header & Navigation (Mobile First)
   ========================================= */
.header {
  height: var(--header-height);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  height: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.accent {
  color: var(--accent-primary);
}

/* Mobile Toggle Hack */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: block;
  cursor: pointer;
  padding: 1rem;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background: var(--text-primary);
  height: 2px;
  width: 24px;
  position: relative;
  transition: all 0.3s ease-in-out;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: "";
  position: absolute;
}

.nav-toggle-label span::before {
  bottom: 8px;
}
.nav-toggle-label span::after {
  top: 8px;
}

/* Mobile Nav State */
.nav-links {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s ease;
  text-align: center;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  display: block;
  padding: 1.5rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* Checkbox Checked State */
#nav-toggle:checked ~ nav .nav-links {
  transform: scaleY(1);
}

#nav-toggle:checked ~ .nav-toggle-label span {
  background: transparent;
}
#nav-toggle:checked ~ .nav-toggle-label span::before {
  bottom: 0;
  transform: rotate(-45deg);
}
#nav-toggle:checked ~ .nav-toggle-label span::after {
  top: 0;
  transform: rotate(45deg);
}

/* Desktop Nav */
@media (min-width: 768px) {
  .nav-toggle-label {
    display: none;
  }

  .nav-links {
    position: static;
    transform: scaleY(1);
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    gap: 2rem;
  }

  .nav-links a {
    padding: 0;
    font-size: 1rem;
  }

  .nav-links .btn-primary {
    padding: 0.5rem 1.25rem;
  }
}

/* =========================================
   4. Hero Section
   ========================================= */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  text-align: center;
}

.hero-content {
  max-width: 800px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* =========================================
   5. About Section
   ========================================= */
.about-grid {
  display: grid;
  gap: 3rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 3fr 2fr;
    align-items: center;
  }
}

.about-text p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.stat-card {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-primary);
}

.stat-card h3 {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.stat-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* =========================================
   6. Projects Section
   ========================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.project-card h3 {
  font-size: 1.5rem;
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.tag {
  background-color: var(--bg-secondary);
  color: var(--accent-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 600;
}

.link-arrow:hover {
  color: var(--accent-primary);
}

.link-arrow:hover svg {
  transform: translateX(4px);
  transition: transform 0.2s ease;
}

/* =========================================
   7. Skills Section
   ========================================= */
.skills-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-group {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-md);
  border-top: 4px solid var(--accent-primary);
}

.skill-icon {
  color: var(--accent-primary);
  width: 48px;
  height: 48px;
  margin-bottom: 1.5rem;
}

.skill-list li {
  color: var(--text-secondary);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.skill-list li:last-child {
  border-bottom: none;
}

/* =========================================
   8. Footer
   ========================================= */
.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    align-items: flex-start;
  }
}

.footer-left h3 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.email-link {
  font-size: 1.25rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.footer-socials {
  display: flex;
  gap: 1.5rem;
}

.footer-socials a {
  color: var(--text-secondary);
  transition: all 0.2s;
}

.footer-socials a:hover {
  color: var(--accent-primary);
  transform: scale(1.1);
}

.copyright {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}